| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 1999 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xerces" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 1999, International |
| * Business Machines, Inc., http://www.apache.org. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| package org.apache.xerces.validators.common; |
| |
| /** |
| * |
| * @version |
| */ |
| public abstract class CMNode |
| { |
| // ------------------------------------------------------------------- |
| // Constructors |
| // ------------------------------------------------------------------- |
| CMNode(int type) throws CMException |
| { |
| fType = type; |
| } |
| |
| |
| // ------------------------------------------------------------------- |
| // Package, abstract methods |
| // ------------------------------------------------------------------- |
| abstract boolean isNullable() throws CMException; |
| |
| |
| // ------------------------------------------------------------------- |
| // Package final methods |
| // ------------------------------------------------------------------- |
| final int type() |
| { |
| return fType; |
| } |
| |
| final CMStateSet firstPos() throws CMException |
| { |
| if (fFirstPos == null) |
| { |
| fFirstPos = new CMStateSet(fMaxStates); |
| calcFirstPos(fFirstPos); |
| } |
| return fFirstPos; |
| } |
| |
| final CMStateSet lastPos() throws CMException |
| { |
| if (fLastPos == null) |
| { |
| fLastPos = new CMStateSet(fMaxStates); |
| calcLastPos(fLastPos); |
| } |
| return fLastPos; |
| } |
| |
| final void setFollowPos(CMStateSet setToAdopt) |
| { |
| fFollowPos = setToAdopt; |
| } |
| |
| final void setMaxStates(int maxStates) |
| { |
| fMaxStates = maxStates; |
| } |
| |
| |
| // ------------------------------------------------------------------- |
| // Protected, abstract methods |
| // ------------------------------------------------------------------- |
| protected abstract void calcFirstPos(CMStateSet toSet) throws CMException; |
| |
| protected abstract void calcLastPos(CMStateSet toSet) throws CMException; |
| |
| |
| // ------------------------------------------------------------------- |
| // Private data members |
| // |
| // fType |
| // The type of node. This indicates whether its a leaf or an |
| // operation. Though we also do derived classes for these types, |
| // it is too expensive to use runtime typing to find this out. |
| // This is one of the ContentSpecNode.NODE_XXX types. |
| // |
| // fFirstPos |
| // The set of NFA states that represent the entry states of this |
| // node in the DFA. |
| // |
| // fFollowPos |
| // The set of NFA states that can be gotten to from from this |
| // node in the DFA. |
| // |
| // fLastPos |
| // The set of NFA states that represent the final states of this |
| // node in the DFA. |
| // |
| // fMaxStates |
| // The maximum number of states that the NFA has, which means the |
| // max number of NFA states that have to be traced in the state |
| // sets during the building of the DFA. Its unfortunate that it |
| // has to be stored redundantly, but we need to fault in the |
| // state set members and they have to be sized to this size. We |
| // init to to -1 so it will cause an error if its used without |
| // being initialized. |
| // ------------------------------------------------------------------- |
| private int fType; |
| private CMStateSet fFirstPos = null; |
| private CMStateSet fFollowPos = null; |
| private CMStateSet fLastPos = null; |
| private int fMaxStates = -1; |
| }; |